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CVE-2018-5241

Quick assessment

Affected
Symantec Corporation Advanced Secure Gateway (ASG)
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Symantec Advanced Secure Gateway（ASG）和ProxySG都是美国赛门铁克（Symantec）公司的安全网关设备。 Symantec ASG和ProxySG中存在身份验证绕过漏洞。远程攻击者可利用该漏洞修改有效的SAML响应并保持响应加密签名有效，从而绕过ASG和ProxySG中身份验证的安全控制。以下产品和版本受到影响：Symantec Advanced Secure Gateway 6.6版本，6.7版本；ProxySG 6.5版本，6.6版本，6.7版本。

AI Predicted 9.8 Difficulty: Easy EPSS 4.62% · P91

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2018-5241

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
Symantec Advanced Secure Gateway (ASG) 6.6 and 6.7, and ProxySG 6.5, 6.6, and 6.7 are susceptible to a SAML authentication bypass vulnerability. The products can be configured with a SAML authentication realm to authenticate network users in intercepted proxy traffic. When parsing SAML responses, ASG and ProxySG incorrectly handle XML nodes with comments. A remote attacker can modify a valid SAML response without invalidating its cryptographic signature. This may allow the attacker to bypass user authentication security controls in ASG and ProxySG. This vulnerability only affects authentication of network users in intercepted traffic. It does not affect administrator user authentication for the ASG and ProxySG management consoles.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Symantec Advanced Secure Gateway和ProxySG 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Symantec Advanced Secure Gateway（ASG）和ProxySG都是美国赛门铁克（Symantec）公司的安全网关设备。 Symantec ASG和ProxySG中存在身份验证绕过漏洞。远程攻击者可利用该漏洞修改有效的SAML响应并保持响应加密签名有效，从而绕过ASG和ProxySG中身份验证的安全控制。以下产品和版本受到影响：Symantec Advanced Secure Gateway 6.6版本，6.7版本；ProxySG 6.5版本，6.6版本，6.7版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Symantec Corporation Advanced Secure Gateway (ASG) 6.6 -
Symantec Corporation ProxySG 6.5 -

II. Public POCs for CVE-2018-5241

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III. Intelligence Information for CVE-2018-5241

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Vendor Advisories for CVE-2018-5241 (2)

Other References for CVE-2018-5241 (1)

IV. Related Vulnerabilities

Same product: Advanced Secure Gateway (ASG)
Same vendor: Symantec Corporation

V. Comments for CVE-2018-5241

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